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Affordable Care Act

The ACA MarketplaceS

How Has Marketplace Enrollment Changed Across States in 2026?

Following several years of rapid enrollment growth in the ACA Marketplaces that corresponded with temporary enhanced premium tax credits, enrollment fell for the first time in seven years in 2026, when those tax credits expired. Every state except for New Mexico saw a drop in Marketplace enrollment from 2025 to 2026. State-based Marketplaces that run their own enrollment platforms, including those that partially offset the enhanced tax credits, generally saw lower drops in enrollment.

About the ACA

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Did the Affordable Care Act Make Health Care More Affordable?

The expiration of the ACA’s enhanced premium tax credits at the start of 2026, combined with rising insurer premiums, put a spotlight on health care affordability that extends beyond Marketplace enrollees. KFF’s Cynthia Cox examines the ACA’s record and the broader underlying question it raises: what’s a fair price for Americans people to pay for health care?

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  • State-by-State Effects of a Ruling for the Challengers in King v. Burwell

    Interactive

    A map and table showing the number of people now receiving premium subsidies who would lose them if the Court finds for the challengers; the total amount of federal subsidy dollars; the average subsidy (or average premium tax credit) that subsidized enrollees have qualified for; and the average increase in premiums that subsidized enrollees would face if the subsidies are disallowed.

  • King v. Burwell and Media Coverage

    News Release

    In his latest column for The Wall Street Journal’s Think Tank, Drew Altman lays out the news media’s challenge covering the upcoming Supreme Court King v. Burwell decision about the Affordable Care Act. All previous columns by Drew Altman are available online.

  • King v. Burwell and Media Coverage

    From Drew Altman

    In this column for The Wall Street Journal’s Think Tank, Drew Altman lays out the news media’s challenge covering the upcoming Supreme Court King v. Burwell decision about the ACA.

  • How Have Insurers Fared Under the Affordable Care Act?

    Perspective

    This analysis tracks the financial performance of insurers in the individual market by evaluating trends in the medical loss ratio (MLR) in the pre-ACA landscape from 2010 to 2013 and estimates the MLR for the first full year of Affordable Care Act implementation in 2014. Findings suggest that although performance varied among insurers, insurers overall had roughly comparable financial performance in 2014 as in recent prior years.

  • Updated for 2015: Tool Displays By Locality the Share of Potential ACA Federal Marketplace Enrollees That Signed Up

    News Release

    An interactive tool from the Kaiser Family Foundation is now updated with 2015 data, allowing users to view on a local level the share of potential enrollees who signed up for a health plan in a federally-based marketplace under the Affordable Care Act. With Mapping Marketplace Enrollment, users can also compare the number of potential and actual enrollees – and the percentage that signed up for a plan -- in 2014 and 2015 within 100,000-resident…

  • Newly Insured Californians Report Easier Access to Care Than the Uninsured

    News Release

    Low-income California adults who gained insurance coverage in 2014 had an easier time accessing health care than those who were uninsured and increased financial protection from medical bills, according to a new Kaiser Family Foundation (KFF) report. The report, funded by the Blue Shield of California Foundation and based on findings from the California sample of the 2014 Kaiser Survey of Low-Income Americans and the ACA, finds that newly-insured Californians were more likely to have…

  • Access to Care for the Insured and Remaining Uninsured: A Look at California During Year One of ACA Implementation

    Issue Brief

    California is a bellwether state for understanding the impact of the Affordable Care Act (ACA). Much attention has been paid to enrollment in California's new coverage options, such as the Medicaid expansion (Medi-Cal) and plans sold through ACA marketplaces (Covered California), and to changes in the uninsured from 2013 to 2014. However, less is known about how this coverage has affected people’s access to care and financial security, and why others remain uninsured. This report,…

  • Coverage Expansions and the Remaining Uninsured: A Look at California During Year One of ACA Implementation

    Report

    California is a bellwether state for understanding the impact of the Affordable Care Act (ACA). Much attention has been paid to enrollment in California's new coverage options, such as the Medicaid expansion (Medi-Cal) and plans sold through ACA marketplaces (Covered California), and to changes in the uninsured from 2013 to 2014. However, less is known about how this coverage has affected people’s access to care and financial security, and why others remain uninsured. This report,…

  • Briefing on the ACA in CA: Year One & Beyond

    Event Date:
    Event

    Continuing an effort to explore Affordable Care Act (ACA) implementation in the states, the Kaiser Family Foundation and the Blue Shield of California Foundation examined ACA implementation in California (CA) at a Sacramento, Calif. briefing and panel discussion on May 28. A state official, experts and advocates discussed issues and challenges related to implementation of the law, and the practical impact of providing coverage to roughly 4.5 million Californians who have coverage via the state…